Abstract Twin boundary (TB) separation is usually observed on the fracture surface of austenitic stainless steels (γ-SS) under the influence of hydrogen. However, previous studies fell short in determining the hydrogen distribution and diffusion behavior at the TB. Scanning Kelvin probe force microscopy (SKPFM) is used to investigate the hydrogen distribution at TB in thermally hydrogen-precharged γ-SS. It is found that there are many martensite (α′) at TBs in the material. TBs with α′ provide fast paths for hydrogen diffusion and some hydrogen is trapped at these areas, which is proposed to be one of the reasons for the TB separation. In contrast, no clear acceleration of hydrogen diffusion and trapping of hydrogen are found at TBs without α′.

中文翻译：

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用扫描开尔文探针力显微镜研究奥氏体不锈钢双晶边界处的氢分布

摘要 在氢作用下，奥氏体不锈钢（γ-SS）的断口表面通常会观察到双晶界（TB）分离。然而，之前的研究在确定 TB 处的氢分布和扩散行为方面存在不足。扫描开尔文探针力显微镜 (SKPFM) 用于研究热预充氢 γ-SS 中 TB 处的氢分布。发现材料中TBs处存在大量马氏体(α')。具有 α' 的 TBs 为氢扩散提供了快速路径，一些氢被困在这些区域，这被认为是 TB 分离的原因之一。相比之下，在没有 α' 的 TBs 中没有发现明显的氢扩散加速和氢捕获。